[ncl-talk] problem in writing binary file ...

[Jatin Kala]

Hi,
This may or may not help solve your problem.
My general experience is, it's easier to deal with direct-access binary 
versus sequential.
I would consider using fbindirwrite rather than fbinrecwrite.

Also in our OPEN statement, have you tried to specify the "ACCESS=" option?
Cheers,
Jatin.


On 10/09/14 8:33 PM, Ufuk Utku Turuncoglu (BE) wrote:
> Hi,
>
> I am trying to write a binary file, which is in following form,
>
> header 1 - 6 float and 2 integer
> header 2 - character (len = 14), holds time information
> data 1 - 2 dimensional data written as a chunk of lons (inside a lat loop)
> data 2 - 2 dimensional data written as a chunk of lons (inside a lat loop)
> header 2
> data 1
> data 2
> ...
> ...
>
> So, my ncl script writes the data as follows,
>
>     ihead = (/ llc(0), urc(0), llc(1), urc(1), 0.25, 0.25, nlat, nlon, 3 /)
>     fbinrecwrite(fname, -1, ihead)
>
>     do k = 0, ntime-1
>       print(k+" "+date_str(k))
>       fbinrecwrite(fname, -1, date_str(k))
>       do i = 0, nlat-1
>         fbinrecwrite(fname, -1, uwnd_rmap(k,i,:))
>       end do
>       do i = 0, nlat-1
>         fbinrecwrite(fname, -1, vwnd_rmap(k,i,:))
>       end do
>     end do
>
> The problem is that the fortran code try to read "header 1" with a
> single read command. Like following,
>
>         OPEN
> (UNIT=IU01,FILE=FILE01(1:LEN),FORM='UNFORMATTED',STATUS='OLD',IOSTAT=IOS)
>         READ (IU01,IOSTAT=IOS) SOUTH, NORTH, WEST, EAST, D_LON, D_LAT,
> N_LAT, N_LON
>
> but the data type are different for header (real for SOUTH, NORTH, WEST,
> EAST, D_LON, D_LAT and integer for N_LAT, N_LON). As it can be seen
> above, i tried to write the header as,
>
>     ihead = (/ llc(0), urc(0), llc(1), urc(1), 0.25, 0.25, nlat, nlon, 3 /)
>
> but fortran file can not read it correctly. It reads "header 1"
> correctly for SOUTH, NORTH, WEST, EAST, D_LON, D_LAT variables but
> N_LAT, N_LON is wrong. So, i think that i have to find another way to
> write header in a single record. I also check that NCL float and integer
> data types and both of them are 32 bits but even the size are same
> fortran reads them wrongly.
>
> I just wonder that is there any other way to write this kind of header
> (has multiple data types) to the binary file.
>
> Regards,
>
> --ufuk
>
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